1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/kernel.h>
3 #include <linux/module.h>
4 #include <linux/init.h>
5 #include <linux/blkdev.h>
7 #include <scsi/scsi_host.h>
9 #include <linux/libata.h>
12 #include <asm/ecard.h>
14 #define DRV_NAME "pata_icside"
16 #define ICS_IDENT_OFFSET 0x2280
18 #define ICS_ARCIN_V5_INTRSTAT 0x0000
19 #define ICS_ARCIN_V5_INTROFFSET 0x0004
21 #define ICS_ARCIN_V6_INTROFFSET_1 0x2200
22 #define ICS_ARCIN_V6_INTRSTAT_1 0x2290
23 #define ICS_ARCIN_V6_INTROFFSET_2 0x3200
24 #define ICS_ARCIN_V6_INTRSTAT_2 0x3290
27 unsigned int dataoffset;
28 unsigned int ctrloffset;
29 unsigned int stepping;
32 static const struct portinfo pata_icside_portinfo_v5 = {
38 static const struct portinfo pata_icside_portinfo_v6_1 = {
44 static const struct portinfo pata_icside_portinfo_v6_2 = {
50 struct pata_icside_state {
51 void __iomem *irq_port;
52 void __iomem *ioc_base;
58 unsigned int speed[ATA_MAX_DEVICES];
62 struct pata_icside_info {
63 struct pata_icside_state *state;
64 struct expansion_card *ec;
66 void __iomem *irqaddr;
68 const expansioncard_ops_t *irqops;
69 unsigned int mwdma_mask;
70 unsigned int nr_ports;
71 const struct portinfo *port[2];
72 unsigned long raw_base;
73 unsigned long raw_ioc_base;
76 #define ICS_TYPE_A3IN 0
77 #define ICS_TYPE_A3USER 1
79 #define ICS_TYPE_V5 15
80 #define ICS_TYPE_NOTYPE ((unsigned int)-1)
82 /* ---------------- Version 5 PCB Support Functions --------------------- */
83 /* Prototype: pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
84 * Purpose : enable interrupts from card
86 static void pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
88 struct pata_icside_state *state = ec->irq_data;
90 writeb(0, state->irq_port + ICS_ARCIN_V5_INTROFFSET);
93 /* Prototype: pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
94 * Purpose : disable interrupts from card
96 static void pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
98 struct pata_icside_state *state = ec->irq_data;
100 readb(state->irq_port + ICS_ARCIN_V5_INTROFFSET);
103 static const expansioncard_ops_t pata_icside_ops_arcin_v5 = {
104 .irqenable = pata_icside_irqenable_arcin_v5,
105 .irqdisable = pata_icside_irqdisable_arcin_v5,
109 /* ---------------- Version 6 PCB Support Functions --------------------- */
110 /* Prototype: pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
111 * Purpose : enable interrupts from card
113 static void pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
115 struct pata_icside_state *state = ec->irq_data;
116 void __iomem *base = state->irq_port;
118 if (!state->port[0].disabled)
119 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_1);
120 if (!state->port[1].disabled)
121 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_2);
124 /* Prototype: pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
125 * Purpose : disable interrupts from card
127 static void pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
129 struct pata_icside_state *state = ec->irq_data;
131 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1);
132 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2);
135 /* Prototype: pata_icside_irqprobe(struct expansion_card *ec)
136 * Purpose : detect an active interrupt from card
138 static int pata_icside_irqpending_arcin_v6(struct expansion_card *ec)
140 struct pata_icside_state *state = ec->irq_data;
142 return readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_1) & 1 ||
143 readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_2) & 1;
146 static const expansioncard_ops_t pata_icside_ops_arcin_v6 = {
147 .irqenable = pata_icside_irqenable_arcin_v6,
148 .irqdisable = pata_icside_irqdisable_arcin_v6,
149 .irqpending = pata_icside_irqpending_arcin_v6,
156 * Similar to the BM-DMA, but we use the RiscPCs IOMD DMA controllers.
157 * There is only one DMA controller per card, which means that only
158 * one drive can be accessed at one time. NOTE! We do not enforce that
159 * here, but we rely on the main IDE driver spotting that both
160 * interfaces use the same IRQ, which should guarantee this.
164 * Configure the IOMD to give the appropriate timings for the transfer
165 * mode being requested. We take the advice of the ATA standards, and
166 * calculate the cycle time based on the transfer mode, and the EIDE
167 * MW DMA specs that the drive provides in the IDENTIFY command.
169 * We have the following IOMD DMA modes to choose from:
171 * Type Active Recovery Cycle
172 * A 250 (250) 312 (550) 562 (800)
173 * B 187 (200) 250 (550) 437 (750)
174 * C 125 (125) 125 (375) 250 (500)
175 * D 62 (50) 125 (375) 187 (425)
177 * (figures in brackets are actual measured timings on DIOR/DIOW)
179 * However, we also need to take care of the read/write active and
183 * Mode Active -- Recovery -- Cycle IOMD type
184 * MW0 215 50 215 480 A
188 static void pata_icside_set_dmamode(struct ata_port *ap, struct ata_device *adev)
190 struct pata_icside_state *state = ap->host->private_data;
196 * DMA is based on a 16MHz clock
198 if (ata_timing_compute(adev, adev->dma_mode, &t, 1000, 1))
202 * Choose the IOMD cycle timing which ensure that the interface
203 * satisfies the measured active, recovery and cycle times.
205 if (t.active <= 50 && t.recover <= 375 && t.cycle <= 425) {
208 } else if (t.active <= 125 && t.recover <= 375 && t.cycle <= 500) {
211 } else if (t.active <= 200 && t.recover <= 550 && t.cycle <= 750) {
219 ata_dev_info(adev, "timings: act %dns rec %dns cyc %dns (%c)\n",
220 t.active, t.recover, t.cycle, iomd_type);
222 state->port[ap->port_no].speed[adev->devno] = cycle;
225 static void pata_icside_bmdma_setup(struct ata_queued_cmd *qc)
227 struct ata_port *ap = qc->ap;
228 struct pata_icside_state *state = ap->host->private_data;
229 unsigned int write = qc->tf.flags & ATA_TFLAG_WRITE;
232 * We are simplex; BUG if we try to fiddle with DMA
235 BUG_ON(dma_channel_active(state->dma));
238 * Route the DMA signals to the correct interface
240 writeb(state->port[ap->port_no].port_sel, state->ioc_base);
242 set_dma_speed(state->dma, state->port[ap->port_no].speed[qc->dev->devno]);
243 set_dma_sg(state->dma, qc->sg, qc->n_elem);
244 set_dma_mode(state->dma, write ? DMA_MODE_WRITE : DMA_MODE_READ);
246 /* issue r/w command */
247 ap->ops->sff_exec_command(ap, &qc->tf);
250 static void pata_icside_bmdma_start(struct ata_queued_cmd *qc)
252 struct ata_port *ap = qc->ap;
253 struct pata_icside_state *state = ap->host->private_data;
255 BUG_ON(dma_channel_active(state->dma));
256 enable_dma(state->dma);
259 static void pata_icside_bmdma_stop(struct ata_queued_cmd *qc)
261 struct ata_port *ap = qc->ap;
262 struct pata_icside_state *state = ap->host->private_data;
264 disable_dma(state->dma);
266 /* see ata_bmdma_stop */
267 ata_sff_dma_pause(ap);
270 static u8 pata_icside_bmdma_status(struct ata_port *ap)
272 struct pata_icside_state *state = ap->host->private_data;
273 void __iomem *irq_port;
275 irq_port = state->irq_port + (ap->port_no ? ICS_ARCIN_V6_INTRSTAT_2 :
276 ICS_ARCIN_V6_INTRSTAT_1);
278 return readb(irq_port) & 1 ? ATA_DMA_INTR : 0;
281 static int icside_dma_init(struct pata_icside_info *info)
283 struct pata_icside_state *state = info->state;
284 struct expansion_card *ec = info->ec;
287 for (i = 0; i < ATA_MAX_DEVICES; i++) {
288 state->port[0].speed[i] = 480;
289 state->port[1].speed[i] = 480;
292 if (ec->dma != NO_DMA && !request_dma(ec->dma, DRV_NAME)) {
293 state->dma = ec->dma;
294 info->mwdma_mask = ATA_MWDMA2;
301 static struct scsi_host_template pata_icside_sht = {
302 ATA_BASE_SHT(DRV_NAME),
303 .sg_tablesize = SG_MAX_SEGMENTS,
304 .dma_boundary = IOMD_DMA_BOUNDARY,
307 static void pata_icside_postreset(struct ata_link *link, unsigned int *classes)
309 struct ata_port *ap = link->ap;
310 struct pata_icside_state *state = ap->host->private_data;
312 if (classes[0] != ATA_DEV_NONE || classes[1] != ATA_DEV_NONE)
313 return ata_sff_postreset(link, classes);
315 state->port[ap->port_no].disabled = 1;
317 if (state->type == ICS_TYPE_V6) {
319 * Disable interrupts from this port, otherwise we
320 * receive spurious interrupts from the floating
323 void __iomem *irq_port = state->irq_port +
324 (ap->port_no ? ICS_ARCIN_V6_INTROFFSET_2 : ICS_ARCIN_V6_INTROFFSET_1);
329 static struct ata_port_operations pata_icside_port_ops = {
330 .inherits = &ata_bmdma_port_ops,
331 /* no need to build any PRD tables for DMA */
332 .qc_prep = ata_noop_qc_prep,
333 .sff_data_xfer = ata_sff_data_xfer32,
334 .bmdma_setup = pata_icside_bmdma_setup,
335 .bmdma_start = pata_icside_bmdma_start,
336 .bmdma_stop = pata_icside_bmdma_stop,
337 .bmdma_status = pata_icside_bmdma_status,
339 .cable_detect = ata_cable_40wire,
340 .set_dmamode = pata_icside_set_dmamode,
341 .postreset = pata_icside_postreset,
343 .port_start = ATA_OP_NULL, /* don't need PRD table */
346 static void pata_icside_setup_ioaddr(struct ata_port *ap, void __iomem *base,
347 struct pata_icside_info *info,
348 const struct portinfo *port)
350 struct ata_ioports *ioaddr = &ap->ioaddr;
351 void __iomem *cmd = base + port->dataoffset;
353 ioaddr->cmd_addr = cmd;
354 ioaddr->data_addr = cmd + (ATA_REG_DATA << port->stepping);
355 ioaddr->error_addr = cmd + (ATA_REG_ERR << port->stepping);
356 ioaddr->feature_addr = cmd + (ATA_REG_FEATURE << port->stepping);
357 ioaddr->nsect_addr = cmd + (ATA_REG_NSECT << port->stepping);
358 ioaddr->lbal_addr = cmd + (ATA_REG_LBAL << port->stepping);
359 ioaddr->lbam_addr = cmd + (ATA_REG_LBAM << port->stepping);
360 ioaddr->lbah_addr = cmd + (ATA_REG_LBAH << port->stepping);
361 ioaddr->device_addr = cmd + (ATA_REG_DEVICE << port->stepping);
362 ioaddr->status_addr = cmd + (ATA_REG_STATUS << port->stepping);
363 ioaddr->command_addr = cmd + (ATA_REG_CMD << port->stepping);
365 ioaddr->ctl_addr = base + port->ctrloffset;
366 ioaddr->altstatus_addr = ioaddr->ctl_addr;
368 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
369 info->raw_base + port->dataoffset,
370 info->raw_base + port->ctrloffset);
372 if (info->raw_ioc_base)
373 ata_port_desc(ap, "iocbase 0x%lx", info->raw_ioc_base);
376 static int pata_icside_register_v5(struct pata_icside_info *info)
378 struct pata_icside_state *state = info->state;
381 base = ecardm_iomap(info->ec, ECARD_RES_MEMC, 0, 0);
385 state->irq_port = base;
388 info->irqaddr = base + ICS_ARCIN_V5_INTRSTAT;
390 info->irqops = &pata_icside_ops_arcin_v5;
392 info->port[0] = &pata_icside_portinfo_v5;
394 info->raw_base = ecard_resource_start(info->ec, ECARD_RES_MEMC);
399 static int pata_icside_register_v6(struct pata_icside_info *info)
401 struct pata_icside_state *state = info->state;
402 struct expansion_card *ec = info->ec;
403 void __iomem *ioc_base, *easi_base;
404 unsigned int sel = 0;
406 ioc_base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
410 easi_base = ioc_base;
412 if (ecard_resource_flags(ec, ECARD_RES_EASI)) {
413 easi_base = ecardm_iomap(ec, ECARD_RES_EASI, 0, 0);
418 * Enable access to the EASI region.
423 writeb(sel, ioc_base);
425 state->irq_port = easi_base;
426 state->ioc_base = ioc_base;
427 state->port[0].port_sel = sel;
428 state->port[1].port_sel = sel | 1;
430 info->base = easi_base;
431 info->irqops = &pata_icside_ops_arcin_v6;
433 info->port[0] = &pata_icside_portinfo_v6_1;
434 info->port[1] = &pata_icside_portinfo_v6_2;
436 info->raw_base = ecard_resource_start(ec, ECARD_RES_EASI);
437 info->raw_ioc_base = ecard_resource_start(ec, ECARD_RES_IOCFAST);
439 return icside_dma_init(info);
442 static int pata_icside_add_ports(struct pata_icside_info *info)
444 struct expansion_card *ec = info->ec;
445 struct ata_host *host;
449 ec->irqaddr = info->irqaddr;
450 ec->irqmask = info->irqmask;
453 ecard_setirq(ec, info->irqops, info->state);
456 * Be on the safe side - disable interrupts
458 ec->ops->irqdisable(ec, ec->irq);
460 host = ata_host_alloc(&ec->dev, info->nr_ports);
464 host->private_data = info->state;
465 host->flags = ATA_HOST_SIMPLEX;
467 for (i = 0; i < info->nr_ports; i++) {
468 struct ata_port *ap = host->ports[i];
470 ap->pio_mask = ATA_PIO4;
471 ap->mwdma_mask = info->mwdma_mask;
472 ap->flags |= ATA_FLAG_SLAVE_POSS;
473 ap->ops = &pata_icside_port_ops;
475 pata_icside_setup_ioaddr(ap, info->base, info, info->port[i]);
478 return ata_host_activate(host, ec->irq, ata_bmdma_interrupt, 0,
482 static int pata_icside_probe(struct expansion_card *ec,
483 const struct ecard_id *id)
485 struct pata_icside_state *state;
486 struct pata_icside_info info;
490 ret = ecard_request_resources(ec);
494 state = devm_kzalloc(&ec->dev, sizeof(*state), GFP_KERNEL);
500 state->type = ICS_TYPE_NOTYPE;
503 idmem = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
507 type = readb(idmem + ICS_IDENT_OFFSET) & 1;
508 type |= (readb(idmem + ICS_IDENT_OFFSET + 4) & 1) << 1;
509 type |= (readb(idmem + ICS_IDENT_OFFSET + 8) & 1) << 2;
510 type |= (readb(idmem + ICS_IDENT_OFFSET + 12) & 1) << 3;
511 ecardm_iounmap(ec, idmem);
516 memset(&info, 0, sizeof(info));
520 switch (state->type) {
522 dev_warn(&ec->dev, "A3IN unsupported\n");
526 case ICS_TYPE_A3USER:
527 dev_warn(&ec->dev, "A3USER unsupported\n");
532 ret = pata_icside_register_v5(&info);
536 ret = pata_icside_register_v6(&info);
540 dev_warn(&ec->dev, "unknown interface type\n");
546 ret = pata_icside_add_ports(&info);
552 ecard_release_resources(ec);
557 static void pata_icside_shutdown(struct expansion_card *ec)
559 struct ata_host *host = ecard_get_drvdata(ec);
563 * Disable interrupts from this card. We need to do
564 * this before disabling EASI since we may be accessing
565 * this register via that region.
567 local_irq_save(flags);
568 ec->ops->irqdisable(ec, ec->irq);
569 local_irq_restore(flags);
572 * Reset the ROM pointer so that we can read the ROM
573 * after a soft reboot. This also disables access to
574 * the IDE taskfile via the EASI region.
577 struct pata_icside_state *state = host->private_data;
579 writeb(0, state->ioc_base);
583 static void pata_icside_remove(struct expansion_card *ec)
585 struct ata_host *host = ecard_get_drvdata(ec);
586 struct pata_icside_state *state = host->private_data;
588 ata_host_detach(host);
590 pata_icside_shutdown(ec);
593 * don't NULL out the drvdata - devres/libata wants it
594 * to free the ata_host structure.
596 if (state->dma != NO_DMA)
597 free_dma(state->dma);
599 ecard_release_resources(ec);
602 static const struct ecard_id pata_icside_ids[] = {
603 { MANU_ICS, PROD_ICS_IDE },
604 { MANU_ICS2, PROD_ICS2_IDE },
608 static struct ecard_driver pata_icside_driver = {
609 .probe = pata_icside_probe,
610 .remove = pata_icside_remove,
611 .shutdown = pata_icside_shutdown,
612 .id_table = pata_icside_ids,
618 static int __init pata_icside_init(void)
620 return ecard_register_driver(&pata_icside_driver);
623 static void __exit pata_icside_exit(void)
625 ecard_remove_driver(&pata_icside_driver);
628 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
629 MODULE_LICENSE("GPL");
630 MODULE_DESCRIPTION("ICS PATA driver");
632 module_init(pata_icside_init);
633 module_exit(pata_icside_exit);